Stock Piston size and other questions...

[timmay316]

I just pulled the head on my talon, and I am just now seeing that the engine is not entirely original, it looks like the last owner went through it (which by any means isnt a bad thing). Stamped in the tops of the pistons is ".630" From my experience with v-8's, I would take this as meaning the block is bored .030 over, but I wasnt sure if DSM works the same way (the only bore specs I have ever seen have been in metric). Could someone please clarify?

 

[talon210]

Not sure if this is what you are lookin for or not but its got some specs.

http://www.mbdsm.org/specs.php

 

[timmay316]

thats nice info to have, but not entirely what I was looking for. After looking a little close, the pistons say 63D, not 630...does that mean anything to anyone? Or is that what is on stock pistons?

 

[projecTSI]

I believe the 63D is on all the stock pistons, just to identify the engine code "4g63". And the stock bore is 85mm.

 

[chico904]

Type: In-Line DOHC
Model: 4g63 Turbo
Number of Cylinders: 4
Bore: 85.0mm (3.35")
Stroke: 88.0mm (3.46")
Displacement: 1997cc (122ci)
Compression Ratio: 7.8:1
Firing Order: 1-3-4-2


Detailed Engine Specs

Rod Length: 150mm (5.906")
Rod-Stroke Ratio: 1.704


Stock Gear Ratios

MT AT
1st: 3.083 2.846
2nd: 1.684 1.581
3rd: 1.115 1.000
4th: 0.833 0.686
5th: 0.666
Reverse: 3.166 2.176
Transfer Gear: 1.090
Final Drive Gear: 3.866 3.562